<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <input type="text">
    <button>输入学生id</button>



    <script>
        const oIpt = document.querySelector("input")
        const oBtn = document.querySelector("button")

        oBtn.onclick = function () {

            const userId = oIpt.value

            const xhr = new XMLHttpRequest()

            xhr.open("get", `http://127.0.0.1:8181/get?userId=${userId}&t=` + Date.now(), true)

            xhr.send()

            xhr.onreadystatechange = function () {
                if (xhr.readyState === 4 & xhr.status >= 200 & xhr.status <= 299) {
                    console.log(xhr.responseText);
                }
            }


        }
    </script>

</body>

</html>